Looking at those images my question is what software can you use well? It is one thing having software but using it proficiently is the major part.
If it was me, I would draw something in SW and then import the image into Photoshop or Coreldraw and play around with it from there. I only say those program because its what I have and can use reasonably well.
Photoworks or Visualise woud also work.
If you're going to be doing lots of these types of images then someone else might have a better idea what is the ideal software package.
You could go to GrabCAD and if there are already models completed and use them. You may want to ask the authors permission. I am positive you can find a lot of what you need...
Hello Alberto,.. as the others have said... it's possible and there are some assets (models) available... albeit, it maybe challenging in SW, imho?
I'll add another idea/option.. SketchUp.. their Warehouse also has a lot of ocean assets, scenes and rendering capabilities.